CVE-2026-53047
In the Linux kernel, the following vulnerability has been resolved: efi/capsule-loader: fix incorrect sizeof in phys array reallocation The krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses sizeof(phys_addr_t *) instead of…
Does this matter?
Lower severity and a low EPSS score (0.14%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: efi/capsule-loader: fix incorrect sizeof in phys array reallocation The krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses sizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be causing an undersized allocation. The allocation is also inconsistent with the initial array allocation in efi_capsule_open() that allocates one entry with sizeof(phys_addr_t), and the efi_capsule_write() function that stores phys_addr_t values (not pointers) via page_to_phys(). On 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this goes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but pointers are 32-bit, this allocates half the required space, which might lead to a heap buffer overflow when storing physical addresses. This is similar to the bug fixed in commit fccfa646ef36 ("efi/capsule-loader: fix incorrect allocation size") which fixed the same issue at the initial allocation site.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.14% probability · 3th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/22022cd8851703a58f67615a17bc7e9e8682785bPatch
- https://git.kernel.org/stable/c/48a428215782321b56956974f23593e40ce84b7aPatch
- https://git.kernel.org/stable/c/5e185330d902b12fe8e6eb4b8514b5d736d8d66dPatch
- https://git.kernel.org/stable/c/608e1f7bc9d171ab26c1fba288c97fc76363c27dPatch
- https://git.kernel.org/stable/c/67adde6bfdfd563a54b045d59aeb9a2d90c80697Patch
- https://git.kernel.org/stable/c/8be69e9245f805566bac68ffc8574b64735fd996Patch
- https://git.kernel.org/stable/c/ab3f7098a3a27175b91cfc947950f5c26855801bPatch
- https://git.kernel.org/stable/c/e0e6b14995fd6fa2c0df8c712d76ab32f0694c31Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.